/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/ParticleHandle.h
Overwite the last N shapes with the data from InShapes. This is a highly dubious operation provided as a utility for use inFPhysInterface_Chaos::AddGeometry. Ideally we would remove this
void MergeShapeInstances ( [FShapeInstanceProxyArray](API\Runtime\Chaos\Chaos\FShapeInstanceProxyArray) && InShapes )